The Kiwi mother of Tiahleigh Palmer has expressed her distress at learning of the charges laid against her murdered daughter's foster family in Queensland.
Detectives investigating the death of 12-year-old Tiahleigh Palmer say they are treating her foster carers' property as a "primary crime scene".
Cindy Palmer has thanked supporters who helped keep the case in the spotlight in the nearly 11 months since her disappearance in late October 2015.
"I have done the best to keep Tiahleigh's case in the spotlight and thank supporters for helping me," she said.
"I will not let her death be in vain."
Detective Inspector Damien Hansen says police are searching the property at Chambers Flat for any evidence in connection with Tiahleigh's murder, including her backpack and school uniform.
Police began digging up the property today, three days after Tiahleigh's foster father, Rick Thorburn, was charged with her murder.
His son Trent, 19, has been charged with incest, perjury and attempting to pervert the course of justice.
Thorburn's wife, Julene, had hired a lawyer prior to the arrests and provided information to police, Mr Hansen confirmed.
Cindy Palmer said: "I'm extremely upset that the people who were entrusted to look after my daughter were the very people who took her innocence and her spirit and her life.
"The only comfort I can take from this situation is that they will never hurt another innocent child.
"My other three children will now grow up without their sister and she will forever be an angel.
"I miss my daughter terribly every day and a piece of my heart is missing."
Mr Hansen he would not comment about whether Thorburn had access to any kind of medication or pills after reportedly attempting to overdose while in custody on Tuesday.
The 56-year-old has been transferred to Arthur Gorrie Correctional Centre after spending two days in an induced coma at Brisbane's Princess Alexandra Hospital.
Trent remains in custody after his bail application was denied by Beenleigh Magistrates Court, which heard he had admitted on Facebook Messenger to having sex with Tiahleigh and was worried she might be pregnant.
Mr Hansen said those messages had been deleted prior to Tiahleigh being reported missing and were not recovered until this month.